Nav: Home

Zika vaccine shows promise for treating deadly brain cancer

September 18, 2018

Washington, DC - September 18, 2018 - An international team of researchers has successfully deployed a Zika virus vaccine to target and kill human glioblastoma brain cancer stem cells, which had been transplanted into mice. In a study published this week in mBio®, an open-access journal of the American Society for Microbiology, the team shows that a live, attenuated version of the Zika virus could form the basis of a new treatment option for this fatal brain cancer.

Glioblastoma kills about 15,000 adults in the US each year and is currently incurable because patients experience a high recurrence rate of their cancer even after the standard treatments of surgery, radiation and chemotherapy. Scientists suspect this recurrence is due to cancer stem cells, called glioblastoma stem cells (GSCs), which hide out in nearby brain tissue even after the combination of therapies.

"During the Zika epidemic, we learned that the virus preferentially infects neural progenitor cells in the fetus, and causes the devastating microcephaly seen in babies born to infected mothers," says Pei-Yong Shi, a virologist at University of Texas Medical Branch in Galveston. He co-led the current study with tumor biologist Jianghong Man of the National Center of Biomedical Analysis in Beijing and virologist Cheng-Feng Qin of the Chinese Academy of Military Medical Sciences in Beijing.

"We made the connection that perhaps Zika virus could also specifically infect the GSCs," because these cells have similar properties to neural stem cells, says Man. In previous work, Shi and his collaborators at Washington University in St. Louis showed that Zika virus did indeed attack and kill GSCs grown in the lab dish and in a mouse model of glioblastoma. In addition, the Zika virus was much less efficient at attacking the differentiated, healthy brain cells. (image: transmission electron micrograph of Zika virus, NIAID)

"If we could find a way to specifically target those GSCs that are the source of recurrence, then that might provide an option to prevent recurrence or even a cure," says Qin.

The team's first objective was to determine if there was a safe way to use Zika virus in patients to attack the cancer cells. Shi's lab has developed a promising live-attenuated Zika vaccine candidate called ZIKV-LAV that had been shown to be safe, non-virulent, and effective in protecting against infection in mice and non-human primates. The ZIKV-LAV has a small deletion from the viral genome that prevents it from replicating itself efficiently.

When the team injected this ZIKV-LAV into the brains of mice, they saw no health effects on the mice, no weight loss, and no behavioral abnormalities such as loss of appetite, depression, lethargy, or self-injury. The mice also functioned normally in tests for anxiety and motor function.

Next, the team wanted to show whether the ZIKA-LAV could work to infect and kill human patient-derived GSCs in a mouse model. So they mixed GSCs from two different human patient donors with the ZIKA-LAV and injected the mixture into the brains of mice. Mice that got the injection of the GSCs only rapidly developed tumors. Mice that got the ZIKV-LAV injected as well saw a significant delay in tumor development. Co-implanting the virus along with the GSCs also prolonged the median survival time of the treated mice to around 50 days, compared to around 30 days for the untreated mice who received GSCs alone.

Qin says that perhaps in the future patients would be given the Zika vaccine at the same time as surgery to "let the viruses hunt down the GSCs and eliminate them."

Finally, the team investigated the cellular mechanisms that the modified Zika virus used to kill the GSCs. They took GSCs treated with the ZIKV-LAV and those GSCs not treated and sequenced all the RNA messages being expressed in these two cell populations. Comparing those profiles, the team found that in the treated cells, the virus triggered a strong antiviral response in the cells, which induced inflammation and eventually cell death.

Next, the team will work with clinicians to develop safety tests of the ZIKV-LAV in glioblastoma patients. They may also modify the Zika virus further to make it an even more potent cancer cell killing machine. For example, Man explains, the researchers could add an immune modulator as a 'cargo' in the viral genome. Then, once such a virus infects a cancer cell and kills it, the immune modulator would be released to alert and activate the patient's systemic immune system against the remaining cancer cells.

"As a virologist, I see that we should take advantage of the 'bad' side of viruses," says Shi. "They should have a role to play in cancer treatment."
-end-
The American Society for Microbiology is the largest single life science society, composed of more than 30,000 scientists and health professionals. ASM's mission is to promote and advance the microbial sciences.

ASM advances the microbial sciences through conferences, publications, certifications and educational opportunities. It enhances laboratory capacity around the globe through training and resources. It provides a network for scientists in academia, industry and clinical settings. Additionally, ASM promotes a deeper understanding of the microbial sciences to diverse audiences.

American Society for Microbiology

Related Cancer Articles:

Cancer mortality continues steady decline, driven by progress against lung cancer
The cancer death rate declined by 29% from 1991 to 2017, including a 2.2% drop from 2016 to 2017, the largest single-year drop in cancer mortality ever reported.
Stress in cervical cancer patients associated with higher risk of cancer-specific mortality
Psychological stress was associated with a higher risk of cancer-specific mortality in women diagnosed with cervical cancer.
Cancer-sniffing dogs 97% accurate in identifying lung cancer, according to study in JAOA
The next step will be to further fractionate the samples based on chemical and physical properties, presenting them back to the dogs until the specific biomarkers for each cancer are identified.
Moffitt Cancer Center researchers identify one way T cell function may fail in cancer
Moffitt Cancer Center researchers have discovered a mechanism by which one type of immune cell, CD8+ T cells, can become dysfunctional, impeding its ability to seek and kill cancer cells.
More cancer survivors, fewer cancer specialists point to challenge in meeting care needs
An aging population, a growing number of cancer survivors, and a projected shortage of cancer care providers will result in a challenge in delivering the care for cancer survivors in the United States if systemic changes are not made.
New cancer vaccine platform a potential tool for efficacious targeted cancer therapy
Researchers at the University of Helsinki have discovered a solution in the form of a cancer vaccine platform for improving the efficacy of oncolytic viruses used in cancer treatment.
American Cancer Society outlines blueprint for cancer control in the 21st century
The American Cancer Society is outlining its vision for cancer control in the decades ahead in a series of articles that forms the basis of a national cancer control plan.
Oncotarget: Cancer pioneer employs physics to approach cancer in last research article
In the cover article of Tuesday's issue of Oncotarget, James Frost, MD, PhD, Kenneth Pienta, MD, and the late Donald Coffey, Ph.D., use a theory of physical and biophysical symmetry to derive a new conceptualization of cancer.
Health indicators for newborns of breast cancer survivors may vary by cancer type
In a study published in the International Journal of Cancer, researchers from the UNC Lineberger Comprehensive Cancer Center analyzed health indicators for children born to young breast cancer survivors in North Carolina.
Few women with history of breast cancer and ovarian cancer take a recommended genetic test
More than 80 percent of women living with a history of breast or ovarian cancer at high-risk of having a gene mutation have never taken the test that can detect it.
More Cancer News and Cancer Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Listen Again: Meditations on Loneliness
Original broadcast date: April 24, 2020. We're a social species now living in isolation. But loneliness was a problem well before this era of social distancing. This hour, TED speakers explore how we can live and make peace with loneliness. Guests on the show include author and illustrator Jonny Sun, psychologist Susan Pinker, architect Grace Kim, and writer Suleika Jaouad.
Now Playing: Science for the People

#565 The Great Wide Indoors
We're all spending a bit more time indoors this summer than we probably figured. But did you ever stop to think about why the places we live and work as designed the way they are? And how they could be designed better? We're talking with Emily Anthes about her new book "The Great Indoors: The Surprising Science of how Buildings Shape our Behavior, Health and Happiness".
Now Playing: Radiolab

The Third. A TED Talk.
Jad gives a TED talk about his life as a journalist and how Radiolab has evolved over the years. Here's how TED described it:How do you end a story? Host of Radiolab Jad Abumrad tells how his search for an answer led him home to the mountains of Tennessee, where he met an unexpected teacher: Dolly Parton.Jad Nicholas Abumrad is a Lebanese-American radio host, composer and producer. He is the founder of the syndicated public radio program Radiolab, which is broadcast on over 600 radio stations nationwide and is downloaded more than 120 million times a year as a podcast. He also created More Perfect, a podcast that tells the stories behind the Supreme Court's most famous decisions. And most recently, Dolly Parton's America, a nine-episode podcast exploring the life and times of the iconic country music star. Abumrad has received three Peabody Awards and was named a MacArthur Fellow in 2011.